PROPOSAL_ENC_ALGS_CTOS
kex_params.proposal[PROPOSAL_ENC_ALGS_CTOS] = cipher;
nenc = ctos ? PROPOSAL_ENC_ALGS_CTOS : PROPOSAL_ENC_ALGS_STOC;
case PROPOSAL_ENC_ALGS_CTOS:
proposal[PROPOSAL_ENC_ALGS_CTOS],